MC-1410: Video Enhancements

- stabilize mftf

Author: irenelagno

app/code/Magento/PageBuilder/Test/Mftf/Test/AdminPageBuilderTabContentTest.xml

@@ -461,6 +461,7 @@
         <!-- Verify Slider in Tab on storefront -->
         <comment userInput="View Tab on storefront" stepKey="viewTabOnStorefront"/>
         <amOnPage url="tabs{{PageBuilderPageTitle.pageName}}" stepKey="amOnPageBuilderPage"/>
+        <waitForElementVisible selector="{{SliderOnFrontend.SliderDisplay}}" stepKey="waitForSliderElementVisable"/>
         <seeElement selector="{{SliderOnFrontend.SliderDisplay}}" stepKey="seeSliderOnPageBuilderPage"/>
         <seeElement selector="{{SlideOnFrontend.slide('1')}}" stepKey="seeSlide1InSlider"/>
         <see userInput="{{PageBuilderSlideItemContent1.value}}" selector="{{SlideOnFrontend.slideContent('0')}}" stepKey="seeSlide1ContentDisplayed"/>